无法将nodemailer错误响应从node.js发送到angular.js

Question

Here I'm sending a mail when the form is submitted. Everything is working fine, the only issue is even though the mail is not sent because of wrong authentication or internet problem ,the user is getting the success message. I want that the user should get an error message if the mail is failed to get sent.

client

    this.mail= function() {
    var data = ({
        name :this.name,
        email :this.email

    })

    //Post Request
      $http({
  method: 'POST',
  url: '/contact2', data
}).then(function successCallback(response) {
    $mdToast.show(

                  $mdToast.simple()
                    .textContent('Thanks for your message '+data.name)
                    .position($scope.getToastPosition())
                    .hideDelay(5000)
                );
  }, function errorCallback(response) {
    $mdToast.show(
             $mdToast.simple()
               .textContent('Something went wrong, Please TRY AGAIN '+data.name)
               .position($scope.getToastPosition())
               .hideDelay(5000)
           );
  });

    });

server

function send(req, res) {
  console.log(req.body);

  var data= req.body
  smtpTransport.sendMail({ 
     from: "<email@gmail.com>", 
     to: data.email, 
     subject: "Website Submission from "+data.name,
     text: 'You have a new submission with the following details...,
  }, function(error, response){  //callback
     if(error){
         console.log(error);
     }if{
         console.log(" Message sent "+data.name);
     }

     smtpTransport.close(); 
  });
  res.json(data);
}

Answer 1

Server : You can create and send error message from server as

if(error){ 
     res.json({ 
      Status : false,
      message : error
     })
}else{ 
     res.json({ Status : true,
     message : 'Success'
     })
}

Client : Here you can capture it by

function successCallback(response) {
if(response.Status){ 
     console.log(response.message);
}// for success
else{ 
     console.log(response.message) 
} //for error

}

Answer 2

You can set and send additional data.emailSent = true or data.emailSent = false as:

if(error){
       data.emailSent = false;
} else{
       data.emailSent = true;
}

On client you can check this flag and show success or failure accordingly.

Answer 3

Thank Zeeshan Hassan and pooja for helping me out, at first I was unable to access the status and message . I just made these few changes to Pooja's solution and its working

function successCallback(response) {
       console.log(response.data.Status);
       if (response.data.Status){console.log(response.data.message);}
`     `else{ console.log(response.data.message) }